Preheat oven to 180 degrees and grease a ring tin. Sift bicarb soda, flour, salt, cinnamon and cocoa together and set aside. Place butter, oil, sugar, orange rind and vanilla together and mix well. Add egg, then mix in zucchini until combined, add dry ingredients and milk. Pour into tin, sprinkle with choc bits and cook for 30 minutes.

Allow to cool and serve with cream or ice cream or on it's own. It is very moist and holds well in kid lunch boxes.